extwee/src/Config/parser.js

A story compiler tool using Twine-compatible formats

/**
 * Parses a JSON object and extracts the StoryFormat, StoryTitle and StoryVersion.
 * @param {object} obj Incoming JSON object.
 * @returns {object} An object containing the extracted results.
 */
export function parser(obj) {
    // Check if the object is a valid JSON object.
    if (typeof obj !== 'object' || obj === null) {
        throw new Error('Error: Invalid JSON object');
    }

    // Extracted results.
    let results = {
        StoryFormat: null,
        Input: null,
        Output: null,
        Mode: null,
        Twine1Project: false,
        StoryFormatVersion: null
    };
    
    // Does the object contain 'StoryFormat'?
    if (Object.hasOwnProperty.call(obj, 'story-format')) {
        results.StoryFormat = obj['story-format'];
    }

    // Does the object contain 'StoryFormatVersion'?
    if (Object.hasOwnProperty.call(obj, 'story-format-version')) {
        results.StoryFormatVersion = obj['story-format-version'];
    } else {
        results.StoryFormatVersion = "latest";
    }

    // Does the object contain 'mode'?
    if (Object.hasOwnProperty.call(obj, 'mode')) {
        results.Mode = obj['mode'];
    }

    // Does the object contain 'input'?
    if (Object.hasOwnProperty.call(obj, 'input')) {
        results.Input = obj['input'];
    }

    // Does the object contain 'output'?
    if (Object.hasOwnProperty.call(obj, 'output')) {
        results.Output = obj['output'];
    }

    // Does the object contain 'twine1-project'?
    if (Object.hasOwnProperty.call(obj, 'twine1-project')) {
        results.Twine1Project = obj['twine1-project'];
    } else {
        results.Twine1Project = false;
    }

    // Return the extracted results.
    return results;
}